nfstest_io1

I/o tool

Usage

nfstest_io -d <datadir> [options]

Overview

This I/O tool is used to create and manipulate files of different types. The arguments allow running for a specified period of time as well as running multiple processes. Each process modifies a single file at a time and the file name space is different for each process so there are no collisions between two different processes modifying the same file.

Options

--version: show program's version number and exit

-h, --help: show this help message and exit

-d DATADIR, --datadir=DATADIR: Top level directory where files will be created, it will be created if it does not exist

-s SEED, --seed=SEED: Seed to initialized the random number generator [default: automatically generated]

-n NPROCS, --nprocs=NPROCS: Number of processes to use [default: 1]

-r RUNTIME, --runtime=RUNTIME: Run time [default: '0']

-v VERBOSE, --verbose=VERBOSE: Verbose level: none|info|debug|dbg1-7|all [default: 'none']

-e, --exiterr: Exit on first error

Read and write:

--read=READ: Read file percentage [default: 40.0]

--write=WRITE: Write file percentage [default: 40.0]

--rdwr=RDWR: Read/write file percentage [default: 20.0]

--randio=RANDIO: Random file access percentage [default: 50.0]

--iodelay=IODELAY: Seconds to delay I/O operations [default: 0.0]

--direct: Use direct I/O

--rdwronly: Use read and write only, no rename, remove, etc.

File operations:

--create=CREATE: Create file percentage [default: 5.0]

--odgrade=ODGRADE: Open downgrade percentage [default: 5.0]

--osync=OSYNC: Open file with O_SYNC [default: 10.0]

--fsync=FSYNC: Percentage of fsync after write [default: 2.0]

--rename=RENAME: Rename file percentage [default: 5.0]

--remove=REMOVE: Remove file percentage [default: 5.0]

--trunc=TRUNC: Truncate file percentage [default: 2.0]

--ftrunc=FTRUNC: Truncate opened file percentage [default: 2.0]

--link=LINK: Create hard link percentage [default: 1.0]

--slink=SLINK: Create symbolic link percentage [default: 0.2]

--readdir=READDIR: List contents of directory percentage [default: 0.5]

--lock=LOCK: Lock file percentage [default: 20.0]

--unlock=UNLOCK: Unlock file percentage [default: 80.0]

--tlock=TLOCK: Lock test percentage [default: 20.0]

--lockfull=LOCKFULL: Lock full file percentage [default: 50.0]

--minfiles=MINFILES: Minimum number of files to create before any file operation is executed [default: 10]

File size options:

--fsizeavg=FSIZEAVG: File size average [default: 1m]

--fsizedev=FSIZEDEV: File size standard deviation [default: 256k]

--rsize=RSIZE: Read block size [default: 64k]

--rsizedev=RSIZEDEV: Read block size standard deviation [default: 8k]

--wsize=WSIZE: Write block size [default: 64k]

--wsizedev=WSIZEDEV: Write block size standard deviation [default: 8k]

--sizemult=SIZEMULT: Size multiplier [default: 1.0]

Logging options:

--createlog: Create log file

--createlogs: Create a log file for each process

--logdir=LOGDIR: Log directory [default: '/tmp']